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LMS1485 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMS1485
Description  5V Low Power RS-485 Differential Bus Transceiver
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LMS1485 Datasheet(HTML) 4 Page - National Semiconductor (TI)

 
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Electrical Characteristics (Continued)
Over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
OH
CMOS High-Level Output
Voltage
I
OH = −4mA
4
V
I
OSR
Short-Circuit Output Current
V
O = GND or VCC
785
mA
I
OZ
Tristate Output Leakage
Current
0.4V
≤V
O
≤+2.4V
−1
1
µA
Power Supply Current
I
CC
Supply Current
Driver Enabled, Output = No Load,
Digital Inputs = GND or V
CC
1.1
2.2
mA
Driver Disabled, Output = No Load,
Digital Inputs = GND or V
CC
1
2.2
mA
Switching Characteristics
Driver
T
PLH,
T
PHL
Propagation Delay Input to
Output
R
L =54
Ω,C
L = 100pF
(Figure 3, Figure 7)
11
20
ns
T
SKEW
Driver Output Skew
R
L =54
Ω,C
L = 100pF
(Figure 3, Figure 7)
1ns
T
R,
T
F
Driver Rise and Fall Time
R
L = 100
Ω,C
L = 100pF
(Figure 3, Figure 7)
510
ns
T
ENABLE
Driver Enable to Ouput Valid
Time
(Figure 4, Figure 8)18
32
ns
T
DISABLE
Output Disable Time
(Figure 4, Figure 8)20
40
ns
Receiver
T
PLH,
T
PHL
Propagation Delay Input to
Output
C
L = 15pF
(Figure 5, Figure 7)
18
33
55
ns
T
SKEW
Receiver Output Skew
(Figure 5, Figure 7)2
ns
T
ENABLE
Receiver Enable Time
(Figure 6, Figure 10)
6
25
ns
T
DISABLE
Receiver Disable Time
(Figure 6, Figure 10)15
25
ns
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics
Note 2: All voltage values, except differential I/O bus voltage, are with respect to network ground terminal.
Note 3: The maximum power dissipation is a function of TJ(MAX), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD =
(TJ(MAX) -TA)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 4: ESD rating based upon human body model, 100pF discharged through 1.5k
Ω.
Note 5: Voltage limits apply to DI, DE, RE pins.
Note 6: Differential input/output bus voltage is measured at the non-inverting terminal A with respect to the inverting terminal B.
Note 7: |
∆VOD| and |∆VOC| are changes in magnitude of VOD and VOC, respectively when the input changes from high to low levels.
Note 8: ESD rating applies to pins 6 and 7
Note 9: ESD rating applies to pins 1, 2, 3, 4, 5 and 8
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